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eMarketer. (November 23, 2016). Number of mobile phone users worldwide from 2015 to 2020 (in billions) [Graph]. In Statista. Retrieved October 27, 2021, from https://www.statista.com/statistics/274774/forecast-of-mobile-phone-users-worldwide/
eMarketer. "Number of mobile phone users worldwide from 2015 to 2020 (in billions)." Chart. November 23, 2016. Statista. Accessed October 27, 2021. https://www.statista.com/statistics/274774/forecast-of-mobile-phone-users-worldwide/
eMarketer. (2016). Number of mobile phone users worldwide from 2015 to 2020 (in billions). Statista. Statista Inc.. Accessed: October 27, 2021. https://www.statista.com/statistics/274774/forecast-of-mobile-phone-users-worldwide/
eMarketer. "Number of Mobile Phone Users Worldwide from 2015 to 2020 (in Billions)." Statista, Statista Inc., 23 Nov 2016, https://www.statista.com/statistics/274774/forecast-of-mobile-phone-users-worldwide/
eMarketer, Number of mobile phone users worldwide from 2015 to 2020 (in billions) Statista, https://www.statista.com/statistics/274774/forecast-of-mobile-phone-users-worldwide/ (last visited October 27, 2021)